Improvement in machines fob, geinding saws



lSaws; and the following is a full, clear, a

@mitch .tant @stent @fitta BAXTER D. WHITNEY, OF WINCIIENDON, MASSACHUSETTS. Letters Patent No. 63,773, dated April 9, 1867.

IMIRGVEMENT IN MACHINES' FOR GRINDING SAWS.

TO ALL WI-IOM IT MAY GONCERN: y

De it known that I, BAXTER D. WHITNEY, of Winchendon, in the county of Worcester, and State of Massachusetts, have invented a new and useful Machine for Grinding, or reducing to an even thickness, Cylindrical nd exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure I represents a plan or top view `of the machine.

Figure 2 shows a side elevation of the same.

The object of my invention is to reduce to a perfectly uniform thickness, by a process of grinding, any

cylindrical saw, whether oi' equal or of a constantly varying diameter. My invention consists in the application and use of grinding-whe ht in contact with the outside, and also,

els, or grindstones, so arranged as to be broug if necessary, with the inside of cylindrical saws after they are formed and welded, brazed, or soldered together, while the saw is made to slowly revolve and traverse longitudinally from end to end, and reverse its movement by the arrangement and action of a suitable mechanism for the purpose.

To enable others skilled in the art to make and use my invention, I w the drawings and to the letters of reference marked thereon.

The bed piece ainay be made of hard wood or of cast metal. On the top of the bed piece is tted a BB, it having standards C C, in the top of which are slots or openings 'O O, to receive the shaft or mandrel D, on whose end the cylindrical saw E is secured for the grinding process. On the mandrel D is placed a large spur gear-wheel, cl, which is driven by the pinion e, supported in the stand f, so as to move lengthwise on the driving-shaft F, as the cylindrical saw is alternately moved endwise when it is being ground. The grinding apparatus consists of a metal frame or sort of lathe head, G, secured to the bed piece A, it having the upper one of which supports thejournal boxes h h, which are adjustable by set-screws On the end of the shaft J the grinding-wheel K is properly secured. rests as it revolves, these arms ill describe it in detail, referring to sliding-frame,

long arms II and I, it', in which boxes the shaft J is mounted. To the end of the lower arm is attached a friction-roll, on which the saw f the roll and grinding-wheelremain the distance set apart by the set-screws t' t', and es the saw passes between the roll and grinder it is reduced to Vuniform thickness. Then it is desirable to grind the inner surface of the saw it may be done at the same time by removing the friction-wheel and having another similarly constructed grinding-wheel shaft and adjustable journal boxes placed on the underside of the lower arm I, .to work opposite the, wheelK; thus each grinding-wheel giving support to the other. When it is desirable to grind the inner surface only, `it is done by lengthening the standards C C, so as to let the outside of the saw rest on the friction-roll, in which case the grinding-wheel will run inside of the saw. The travelling lateral motion is given to the saw, while grinding, by the feed-screw L, which is connected by a belt and series of cog-wheels, c b lm, to the driving-shaft, and the motion is reversed by the action of the tripping-ball levc.

Maud belt shifter N, on the pulleys opg, which is operated by the sliding-frame B B, as it impinges agains vthe 'pins r s, in the slide-bar l?, which is connected with the lower end of the ball lever M. NWhen the saw i being ground the mandrel D is not confined in the opening O O so but that it can move up and down so as t allow the saw to rest firmly on the friction-roll j, in case the saw is not perfectly true. When Vthe saw to b ground is made with a constantly varying diameter'or bulging in the form of a barrel, the carriage or sliding frameB B is made to traverse on ways curved to correspond to 'the bulge of the saw.

The use of cylindrical saws for getting out staves for barrels, kegs, tubs, buckets., and for all kinds cylindrical work in wood, is an immense saving of labor and material, and the more perfect they can be ma( the thinner they may be, thereby saving lumber and working more easily. It is very important that saws shou be made of-uniform thickness, (a result almost impossible heretofore,) otherwise they will not balance on t mandrel, therefore they can be run only at low speed, whereas saws reduced by this process are perfect balanced, thus enabling them to Abe run at `being made ridged, the surfaces o a very increased velocity without jar or trembling; thus it will seen that there is much advantage in my mode of constructing machinery for the purpose. i

Having thus fully described my invention, I claim reducing the plates of cylindrical saws to aneven a uniform thickness by means of the sliding-frame B, on which the saw E is supported, revolved, and mov laterally, by the action of the reversible screw L, slide P, and lever INI, iucoinbination with theV grindstone grinding-wheel K, arranged and operating lin the manner substantially as herein described for the purpo set forth.

BAXTER D. WHITNEY.

Witnesses:

WM. Munnocn, B; R. DAY. 

